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Date: Thu, 25 Feb 2016 17:27:23 -0800 From: Stefan Agner <stefan@...er.ch> To: Boris Brezillon <boris.brezillon@...e-electrons.com> Cc: David Woodhouse <dwmw2@...radead.org>, Brian Norris <computersforpeace@...il.com>, linux-mtd@...ts.infradead.org, Daniel Mack <daniel@...que.org>, Haojian Zhuang <haojian.zhuang@...il.com>, Robert Jarzmik <robert.jarzmik@...e.fr>, Kukjin Kim <kgene@...nel.org>, Krzysztof Kozlowski <k.kozlowski@...sung.com>, linux-samsung-soc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...ux-mips.org, Nicolas Ferre <nicolas.ferre@...el.com>, Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>, Alexandre Belloni <alexandre.belloni@...e-electrons.com>, Wenyou Yang <wenyou.yang@...el.com>, Josh Wu <rainyfeeling@...look.com>, Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>, Maxime Ripard <maxime.ripard@...e-electrons.com>, Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com, Kyungmin Park <kyungmin.park@...sung.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org, punnaiah choudary kalluri <punnaia@...inx.com>, Priit Laes <plaes@...es.org>, Kamal Dasu <kdasu.kdev@...il.com>, bcm-kernel-feedback-list@...adcom.com, linux-api@...r.kernel.org Subject: Re: [PATCH v3 00/52] mtd: rework ECC layout definition Hi Boris, On 2016-02-25 16:57, Boris Brezillon wrote: > Hello, > > This patchset aims at getting rid of the nand_ecclayout limitations. > struct nand_ecclayout is defining fixed eccpos and oobfree arrays which > can only be increased by modifying the MTD_MAX_ECCPOS_ENTRIES_LARGE and > MTD_MAX_OOBFREE_ENTRIES_LARGE macros. > This approach forces us to modify the macro values each time we add a > new NAND chip with a bigger OOB area, and increasing these arrays also > penalize all platforms, even those who only support small NAND devices > (with small OOB area). > > The idea to overcome this limitation, is to define the ECC/OOB layout > by the mean of two functions: ->ecc() and ->free(), which will > basically return the same information has those stored in the > nand_ecclayout struct. > > Another advantage of this solution is that ECC layouts are usually > following a repetitive pattern (i.e. leave X bytes free and put Y bytes > of ECC per ECC chunk), which allows one to implement the ->ecc() > and ->free() functions with a simple logic that can be applied > to any size of OOB. > > Patches 1 to 4 are just cleanups or trivial fixes that can be taken > independently. > > Also note that the last two commits are removing the nand_ecclayout > definition, thus preventing any new driver to use this structure. > Of course, this step can be delayed if some of the previous patches > are not accepted. Is the patch set somewhere available to pull from? Do I see things right that patch 21/52 contains the crucial function nand_ooblayout_ecc_lp which calculate the ECC position? (for those who do not provide mtd_ooblayout_ops anyway...) -- Stefan > > Best Regards, > > Boris > > Changes since v2: > - fixed a few bugs in the core and driver implementations > > Changes since v1: > - unified the way of defining ECC and free bytes > - fixed a few bugs in some ->ecc()/->free() implementations > - added new helpers to ease ECC and free bytes manipulation > - separated driver changes in different commits to ease review > - dropped already applied patches > > *** BLURB HERE *** > > Boris Brezillon (52): > mtd: kill the ecclayout->oobavail field > mtd: create an mtd_oobavail() helper and make use of it > mtd: mtdswap: remove useless if (!mtd->ecclayout) test > mtd: nand: simplify nand_bch_init() usage > mtd: add mtd_ooblayout_xxx() helper functions > mtd: use mtd_ooblayout_xxx() helpers where appropriate > mtd: nand: core: use mtd_ooblayout_xxx() helpers where appropriate > mtd: nand: atmel: use mtd_ooblayout_xxx() helpers where appropriate > mtd: nand: fsl_ifc: use mtd_ooblayout_xxx() helpers where appropriate > mtd: nand: gpmi: use mtd_ooblayout_xxx() helpers where appropriate > mtd: nand: lpc32xx: use mtd_ooblayout_xxx() helpers where appropriate > mtd: nand: omap2: use mtd_ooblayout_xxx() helpers where appropriate > mtd: onenand: use mtd_ooblayout_xxx() helpers where appropriate > mtd: add mtd_set_ecclayout() helper function > mtd: use mtd_set_ecclayout() where appropriate > mtd: nand: use mtd_set_ecclayout() where appropriate > mtd: onenand: use mtd_set_ecclayout() where appropriate > mtd: docg3: use mtd_set_ecclayout() where appropriate > mtd: create an mtd_ooblayout_ops struct to ease ECC layout definition > mtd: docg3: switch to mtd_ooblayout_ops > mtd: nand: implement the default mtd_ooblayout_ops > mtd: nand: bch: switch to mtd_ooblayout_ops > mtd: nand: sharpsl: switch to mtd_ooblayout_ops > mtd: nand: jz4740: switch to mtd_ooblayout_ops > mtd: nand: atmel: switch to mtd_ooblayout_ops > mtd: nand: bf5xx: switch to mtd_ooblayout_ops > mtd: nand: brcm: switch to mtd_ooblayout_ops > mtd: nand: cafe: switch to mtd_ooblayout_ops > mtd: nand: davinci: switch to mtd_ooblayout_ops > mtd: nand: denali: switch to mtd_ooblayout_ops > mtd: nand: diskonchip: switch to mtd_ooblayout_ops > mtd: nand: docg4: switch to mtd_ooblayout_ops > mtd: nand: fsl_elbc: switch to mtd_ooblayout_ops > mtd: nand: fsl_ifc: switch to mtd_ooblayout_ops > mtd: nand: fsmc: switch to mtd_ooblayout_ops > mtd: nand: fsmc: get rid of the fsmc_nand_eccplace struct > mtd: nand: gpmi: switch to mtd_ooblayout_ops > mtd: nand: hisi504: switch to mtd_ooblayout_ops > mtd: nand: jz4780: switch to mtd_ooblayout_ops > mtd: nand: lpc32xx: switch to mtd_ooblayout_ops > mtd: nand: mxc: switch to mtd_ooblayout_ops > mtd: nand: omap2: switch to mtd_ooblayout_ops > mtd: nand: pxa3xx: switch to mtd_ooblayout_ops > mtd: nand: s3c2410: switch to mtd_ooblayout_ops > mtd: nand: sh_flctl: switch to mtd_ooblayout_ops > mtd: nand: sm_common: switch to mtd_ooblayout_ops > mtd: nand: sunxi: switch to mtd_ooblayout_ops > mtd: nand: vf610: switch to mtd_ooblayout_ops > mtd: onenand: switch to mtd_ooblayout_ops > staging: mt29f_spinand: switch to mtd_ooblayout_ops > mtd: nand: kill the ecc->layout field > mtd: kill the nand_ecclayout struct > > arch/arm/mach-pxa/spitz.c | 55 +++- > arch/mips/include/asm/mach-jz4740/jz4740_nand.h | 2 +- > arch/mips/jz4740/board-qi_lb60.c | 87 +++--- > drivers/mtd/devices/docg3.c | 51 +++- > drivers/mtd/mtdchar.c | 123 ++++++-- > drivers/mtd/mtdconcat.c | 2 +- > drivers/mtd/mtdcore.c | 358 ++++++++++++++++++++++++ > drivers/mtd/mtdpart.c | 28 +- > drivers/mtd/mtdswap.c | 24 +- > drivers/mtd/nand/atmel_nand.c | 130 ++++----- > drivers/mtd/nand/bf5xx_nand.c | 51 ++-- > drivers/mtd/nand/brcmnand/brcmnand.c | 262 ++++++++++------- > drivers/mtd/nand/cafe_nand.c | 45 ++- > drivers/mtd/nand/davinci_nand.c | 118 +++----- > drivers/mtd/nand/denali.c | 51 +++- > drivers/mtd/nand/diskonchip.c | 60 +++- > drivers/mtd/nand/docg4.c | 34 ++- > drivers/mtd/nand/fsl_elbc_nand.c | 83 +++--- > drivers/mtd/nand/fsl_ifc_nand.c | 245 +++++----------- > drivers/mtd/nand/fsmc_nand.c | 322 ++++++--------------- > drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 61 ++-- > drivers/mtd/nand/hisi504_nand.c | 27 +- > drivers/mtd/nand/jz4740_nand.c | 2 +- > drivers/mtd/nand/jz4780_nand.c | 19 +- > drivers/mtd/nand/lpc32xx_mlc.c | 50 ++-- > drivers/mtd/nand/lpc32xx_slc.c | 58 +++- > drivers/mtd/nand/mxc_nand.c | 212 +++++++------- > drivers/mtd/nand/nand_base.c | 344 ++++++++++++----------- > drivers/mtd/nand/nand_bch.c | 46 ++- > drivers/mtd/nand/omap2.c | 241 +++++++++------- > drivers/mtd/nand/pxa3xx_nand.c | 104 ++++--- > drivers/mtd/nand/s3c2410.c | 32 ++- > drivers/mtd/nand/sh_flctl.c | 87 ++++-- > drivers/mtd/nand/sharpsl.c | 2 +- > drivers/mtd/nand/sm_common.c | 93 ++++-- > drivers/mtd/nand/sunxi_nand.c | 114 ++++---- > drivers/mtd/nand/vf610_nfc.c | 34 +-- > drivers/mtd/onenand/onenand_base.c | 262 ++++++++--------- > drivers/mtd/tests/oobtest.c | 49 ++-- > drivers/staging/mt29f_spinand/mt29f_spinand.c | 49 ++-- > fs/jffs2/wbuf.c | 6 +- > include/linux/mtd/fsmc.h | 18 -- > include/linux/mtd/mtd.h | 69 ++++- > include/linux/mtd/nand.h | 5 +- > include/linux/mtd/nand_bch.h | 8 +- > include/linux/mtd/onenand.h | 2 - > include/linux/mtd/sharpsl.h | 2 +- > include/uapi/mtd/mtd-abi.h | 2 +- > 48 files changed, 2375 insertions(+), 1754 deletions(-)
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